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Choose the correct statement:
Option: 1
All mammals are viviparous.
Option: 2
. All cyclostomes do not possess jaws and paired fins.
Option: 3
All reptiles have a three-chambered heart.
Option: 4
All Pisces have gills covered by an operculum.
Answers (1)
Class Cyclostomata - Characteristics Features -
- This class includes the most primitive vertebrates, the lampreys and hagfishes.
- Hagfishes are scavengers and lampreys are ectoparasite.
- They have a sharp, circular jawless mouth with horny teeth.
- They have a slender eel-like body.
- They do not have paired fins.
- The cranium and vertebral column are made up of cartilage.
- They have closed circulatory system with two-chambered heart.
-
Cyclostomes are jawless and do not have paired fins.
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